Highly amusing bird? (7)
I believe the answer is:
skylark
'highly amusing bird?' is the definition.
'skylark' can be an answer for 'bird?' (skylark is a kind of bird). I am unsure of the 'highly amusing' bit.
'amusing bird?' is the wordplay.
'amusing' becomes 'sky' (I can't justify this - if you can you should give a lot more credence to this answer).
'bird?' becomes 'lark' (lark is a kind of bird).
'sky'+'lark'='SKYLARK'
Can you help me to learn more?
(Other definitions for skylark that I've seen before include "Early rising bird" , "Common songbird" , "Bird (of 23?)" , "Bird that sings aloft" , "Play boisterously" .)